Year	constant 2015 US$
1991	17215.138251372904
1992	17320.712701782573
1993	17350.184621170945
1994	17014.351540659973
1995	16663.09802034674
1996	16679.87903917385
1997	16989.75976350116
1998	16959.654842606797
1999	17011.347370454074
2000	17172.541718607492
2001	16818.802807587614
2002	16631.477624098177
2003	16343.977862395726
2004	16574.110479463976
2005	16716.443619643545
2006	16954.778120265855
2007	17430.194112542886
2008	17680.5797632066
2009	17276.127329879662
2010	17915.263100408014
2011	18313.107489774506
2012	18338.957585876215
2013	18512.40822519347
2014	18531.594429293236
2015	18598.072117437856
2016	18313.520652204796
2017	18333.284417594736
2018	18328.020479062994
2019	18047.968847403663
2020	18343.57215433427
2021	18414.54944983299
2022	18157.726778168675